Radiometric dating of igneous rocks

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Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state. Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists. Then, in , radioactivity was discovered. Recognition that radioactive decay of atoms occurs in the Earth was important in two respects: It provided another source of heat, not considered by Kelvin, which would mean that the cooling time would have to be much longer.
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Radiometric dating

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Radiometric Age Dating - Geology (U.S. National Park Service)

Most absolute age determinations in geology rely on radiometric methods. The earth is billions of years old. The main condition for the method is that the production rate of isotopes stays the same through ages, i. The production of isotopes from chemical elements is known as decay rate and it is considered a constant. Because it is driven by sun activity it was always questioned. Recent article S.
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What can radiometric dating tell us about the age of rocks that the law of superposition cannot

By means of rocks can be determined? Most of a rock or a rock. It was formed. Radiometric dating methods. The rock.
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Igneous petrology is the study of igneous rocks —those that are formed from magma. As a branch of geology , igneous petrology is closely related to volcanology , tectonophysics , and petrology in general. The modern study of igneous rocks utilizes a number of techniques, some of them developed in the fields of chemistry , physics , or other earth sciences. Petrography , crystallography , and isotopic studies are common methods used in igneous petrology. The composition of igneous rocks and minerals can be determined via a variety of methods of varying ease, cost, and complexity.
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